Machine for manufacturing dynamo armatures



Dec. M 3945. L. E. POOLE ETAL 2,390,897

MACHINE FOR MANUFACTURING DYNAMO ARMATURES Original Filed Jan. 6, 1940 13 Sheets-Sheet l M m Th ATTORNEYS INVENTORS LoRA E. Poous (2 BY ERNEST 7:? 153055157 Dec 11, 1945. N E. POOLE ETAL 2,390,897

MACHINE FOR MANUFACTURING DYNAMO ARMATURES I Original Filed Ja n. 6, 1940 13 Sheets-Sheet? mvzuro's Lama 15. Pam: and

- Dec. 11, 1945. E. POOLE ETAL 2,390,897

MACHINE FOR MANUFACTURING DYNAMO A RMATURES Original Filed Jan. 6, 1940 13 Sheets-Sheet .3

INVENTORS [ORA f. P0045 and 7min- ATTOR N EYS Dec. 11,1945. E. POOLE ETAL MACHINE FOR MANUFACTURING DYNAMO ARMATURES Original Filed Jan. 6, 1940 13 Sheets-Sheet 4 INVENTORS [ORA Z: Poo/.5 chi BY f/FNEST R FAUJSET Mm r914 The/r ATTORN EYS Dec. 11, 1945. L. E. POOLE ETAL 2,390,897

MACHINE FoR MANUFACTURINfi DYNAMO ARMATURES Original Filed Jan. 6, 1940 '15 Sheets-Sheet 5 lllllllllllllll Jfl 2/5 2/2 3; 373 4 1% 2/7 I j 2.

INVENTORS [ORA 5. P004: arZ 429?: i BY ERA/Ear R 5105367 7712"- ATTOR N EYS MACHINE FOR MANUFACTURING DYNAMO ARMATURES Original Filed Jan. 6, 1940 is Sheets-She a s ,/J use m an as my 40 Y AWJ j 5 196 z 9 I 20/ 200 "9/ 2 m /99 193 g; E3 M3 43 [97 INVENTORS [om Poo/.5 "a ERNEST 7?. 59055.57 M6 9 41.- Their ATTOR 11,1945; I L.HE. POOLE ET-AL MACHINE FOR MANUFACTURING DYNAHO ARMA'I'UERES Original Filed Jan. 6, 1940 13 Sheets-Sheet 8- INVENTORS ZORA 6 POOLE and Ekwssr R fiwsssr Mf-Mv Dec. 11, 1945. L. POOLE ETAL 2,390,897

MACHINE. FOR MANUFACTURING DYNAMO ARMATURES Qriginal Filed Jan. 6, 1940 13 Sheets-Sheet 9 v z= r INVENTOR [own A. POOLE one! 259% Z3 fRNEST R fiwssfr' y W WV 21M m5- ATTORNEYS Dec. 11, 1945. L. E. POOLE ETAL I MACHINE FOR MANUFACTURING DYNAMO ARMATURES Origjmal Filed Jan. 6, 1940 13 Sheets-Sheet 1O M v a c nww M w a fan N 3v. R NS m n m R W s w J m m A 3% @wm m m m U......H..P.. & RM 8 A $4 wmnw w v. Nb

Dec. 11, 1945. L., :.]=S L E ETAL 2,39%,897

MACHINE FOR MANUFACTURING DYNAMO ARMATURES Original Filed Jan. 6, 1940 15 Sheets-Sheet 11 3 INVENTORS BYZORA f. POOLE and [Rut-5T A. B1 ussET n.2,, ATTORNEYS Em. HE, 1%5. L. E. POOLE ETAL 7 MACHINE FOR MANUFACTURING DYNAMO ARMATURES Original Filed Jan. 6, 1940 15 Sheets- Sheet 12 tom 5. POOLE and ER R F W 12:

m i- ATTORNEYS Bee, H, 5945. L. E. POOLE ETAL MACHINE FOR MANUFACTURING DYNAMO ARMATURES Original Filed Jan. 6, 1940- 15 Sheets-Shget 13 INVENTOR tom: 6'. POOLE and BY Elm/cs1- R FAIISSET 7W91L hen- ATTOR N EYS Patented Dec. 11, 1945 UNITED STATES PATENT OFFICE MACHINE FOR MANUFACTURING DYNAMO ARMATURES Lora E. Poole and Ernest R. Fausset, Anderson, Ind assignors to General Motors Corporation. Detroit, Mich, a corporation of Delaware Original application January 6, 1940, SerialNo. 312,796. Divided and this application February 9, 1942, Serial No. 430.030

6 Claims. (Cl. 270-494) This application is a division of the copending cross sectional dimension, and means for severing ap lication of Lora E. Poole and Ernest R. Fausa required length of folded material from the set, Serial Number 312,796, filed January 6, i940, remaining portion of folded material being supand covers a machine for making core slot inplied by the use of a shear blade moving radially sulating strips. of the armature while the strip is being com- The present invention is embodied in a nove D process of making strips for retaining the wind- Further obje ts and advantages of the Present ings Of'the a m ure f dynamo electric mainvention will be apparent from the following chines in the longitudinal grooves in the core of description, reference being had to the accomsuch armatures. It has been the practice to panying draw n s wh p g embodlforce into the slots of the core and upon the windment of the present invention is clearly shown. ings therein strips of insulating material for the In the drawings: purpose of confining the windings within the Fig. 1 is a perspective view showingthe front slots against the action of centrifugal force. and left hand side of a machine embodying the Such strips of insulating material have been cut pre nt inv nti irom sheet insulating material, or from rope of Fig. 2 is a. fragmentary perspective view of the twisted flber or paper. Inthe case of sheet infront of the machine on a larger scale than sulating material it has been the practice to use Fi 1.

a machine which cuts the strips and applies them Fig. 3 is a perspective view loolnng approxito the slots of the armature core. when fiber or mately in the direction of the arrow 3 of Fig. 1 paper rope is used this material is supplied on and showing principally the mechanism for foldreels and is fed by the'inachine to a' position raing the insulating material which provides the dially opposite anarmature slot. The machine insulating strips for the armature core slots.

includes a mechanism for'cutting oil the desired Fig. 4 is a fragmentary plan view.

length of rope and inserting it between the core Fig.5 is an end view on the line 5-5 of Fig. 4.-

teeth. v Fig. 6 is a sectional view on the line 6-6 of The present invention relates to a machine for Fig. 4.

making folded strips from insulating material Fig. 7 is a sectionalview on the line 1-1 of such as paper which is relatively tough and some- Fig. 4. what resilient. The machine folds the paper in Fig. 8 is a sectional view on the line 6-8 of such a. manner as to provide a body which is Fig. 4.

oblong in cross-section so that it can be passed Fig. 9 is a sectional view on the line 8-9 of in the direction of its longer cross-sectional di- Fig. 4.

mension between adjacent core teeth defining Figs. 10, 11, 12.13, 14, 15 and 16' are sectional the throat of a winding slot. The strip is so views of the insulating material at various stages folded that, after having passed the throat of the of formation starting with the flat stage at Fig. slot, it is permitted to expand and fill up that 10 and ending with the folded-stage inFig. 16. portion of the slot immediately inside of the Fig. 1'1 is a sectional view taken substantially throat and thus take a shape by increasing its on the line i|--ll of Fig. 5.

bulk which enables it to resist centrifugal force Fig. 1a is a fragmentary end elevation looking acting upon the strip and the windings. In the generally 1n the direction of wow g of 3 patent of Lora E. Poole.'Patent No. 2,205,822, and mcmdes sectional views on the unesjhnv :sfsufefi June agitggoblthiere istdlilsclfig of Figs. 4 and 22. Fig. 18 shows the strip inmanner and of assembling the length of such ifiiiiit fhfiw et 'fiiiciiftloit h fnti faded material with a wound armature in the position i ust b iore the machine comes It is the aim and object of the present inveninto home position.

tion to provide in a single machine means for folding a strip of aper unwound from a supply 19 is mental? View Similar to 18 roll, in the manner disclosed in said Poole patent, showing m parts in the normal and for feeding the folded material to a location m M v adjacent the core slot, the paper. being located 30 l mom ntary view on the with its longer cross-sectional dimension extende li -lid of Fig. 19 showing certain parts in ing radially of the armature core, means forcomvhome P ionpressing the strip in the direction of its shorter. 8. 21 i a View similar to Fig-261ml; showassess? oentrlctoshafttt. 'ihegroove llreceivesanec-' centricstrapll connectedwithanadiustablelink 'ortin'nbucklellhavingscrewthreadsatits pivot block "which is attached by pivot pin I. to

,l 'lg.24-isasectiona1viewornihelinellltof Fig. 22.

Figs.25and26areenlargedscalesectional views of the armature assembly and certain arts of the machine in diiferentpositiom of operation.

General construction and power drive Referring now to Fig. 1 which shows a general perspective view of the machine "designates a machine base or table supported by legs 3! and t2 tied together by cross bar It with support plates 34 and 35 between which there are supported two paper supply reels II and I! mounted on pivot rods 38 and It, respectively.

The base ll is provided with a wide groove or recess at it located between two side flanges ll and II. The recess 4| receives pedestal frames 43 and 46 which together cooperate tovprovide a cylindricai'ehamber for receiving and supporting an armature. .The pedestals l3 and ll support a mechanism, to be described later, for severi s lengths of folded insulation material and for inserting such lengths into the core slots of an armature. said armature being indexed or intermittentlyrotated to bring its slots successively.

into strip receiving position. The pedestals 43 and 44 support a platform it which provides a tie for the pperends of the pedestals. Platform ll supports an electric motor II which provides the sole source of power for the machine. Upon the shaft of motor II is mounted a small gear, not shown. which meshes with a gear ii which is mounted upon a crank shaft 82 and which is connected with said shaft by means of a clutch desi nated in its entirety by C. details of which will be described later. v

Referring to Fig. 22, the shaft 82 is journalled in bearings provided by the pedestal l3. Shaft I2 is provided with gear portions I! and I. joined by crank arm portion II. The platform 4' provides bearing brackets I which cooperate with hearing caps II to support bearings for an idler shaft is carrying gears." and It which mesh respectivclv with gears I and It of the shaft 2.

-oppositeendsof pp tepltch.asshowninm aandi'l. Eccentrlclinkllisconnectedwitha aslidell guidedbywaysllandll andwaycover plates Ill and ill respectively. The slide 01 carlies a pivot pin III which supports a pawl I03 urged by a spring Ill into engagement with a ratchet III. Ratchet III is provided by a tubular shaft-i (Fig. 9) journalledinabearing it! provided by a bearing bracket I" supported by table ll. Shaft III! is provided at its right hand end (Fig. 9) witha tapered counterbore III which cpoperates with resilient arms I of a tri-furcated collet chuck sleeve iii, which is screwthreadedly attached to a sleeve ii! slidably associated with the tubular shaft I". The sleeve I i2 is urged toward the left by a heavy spring I ll located betweenthe left end of shaft ill and the head ill of the sleeve 2. The function of the spring 8 is yieldingly to urge the trifurcated collet chuck element Iii against the right hand tapered counter-bored end of the shaft Ill thereby causing the resilient elements ill of said collet chuck memberilitoseizetheshaftsofthearmature assembly adaptcdto be supported within an armature receiving recess ll. The shaft III is o screwthreadedlyassociatedwithaswprod "Sengagedbyan arm H1 ofabellcrank lever lit pivotedat lit uponabracket Ill suspendedfrom thetable II (Fig. 9). Lever illhssanarm ill whichterminatesinspacedears I22 (Fig. 1) across 3 whichislocatedapin lltconnectedbyarod I24 witha pedal lever III pivoted upon a pin it! cor-' ried by a bracket in suspended by bolts I28 from thecrcssbarllandspscedfromthecrossbar II by tubes III which surround the bolts I28.

40 Pedal ill includes a foot pad Ill by which the sureofthecolletchuckllpdnsaidshaftfi. The

Pedestal ll provides bearings for a crank shaftrighthsndendofrodlll providesalimitingstop fortheshafts. Rod iilisadjustablysecured iothesleeveiilthroughitsscrewthreadconnection and is locked in the desired position of longitudinaladdustmentbyalocknutilla. Bincethe rodlliisadjustablethemachinemavbereadily adapted to accommodate armature assemblies havin'gshaftsflofvlryinglcmt srelativetothe endlaminationsofthearmaturecoil.

Itwillbeunderstood thatan armature assembly A isfllpp ried not only by the collet chuck showninl'ig.9,butbythewalkofthepedestals it and ll-which,asshown'in Pig. 1, define the armaturereceivingrecessll.

Returning now to the flu-theidescription of the indexing mechanism, it will be understood thatrotationoftheshaftueflectloscillationoftheeceentrieflandreciprocaticnoftheslide l'landofthepawl illtoeifeetintermittentrm tationo'ttheshaftilt. Themechsnismforpreventingthebackingupcftheratchetllland mermstomasmsimomum are'keyedamainsecentricinemberllandec- 'cmtriceapmemberliprovidingagroonflccof thetccthcltla of ratchet I... Dog ill is for-securing the proper location thereof after anintsrmittent movement dth'elhaft I" will :o'w'bs descrlbed-particulariywith reierenceto lllcai'l'iellpl otltudlilalur portinsaratehetlockingdcllllhavinsatooth ml: which his in accuratel betwsenthespaces be cammed out from the space between adjacent teeth I05, but must be positively retracted.

Movement of the slide 91 is used positively to effect retraction of the dog tooth I3Ib from the ratchet I05. For this purpose the slide 91 is provided with an extension I38 having a notch defined by two side surfaces I38a and I38b, As

shown in Fig. 8, the side surface I881) is engaged by a pin I32a carried by a cam I32 pivotally mounted at I33 upon the bracket I08. As the slide 91 and the extension I38 are moved to the right from the position shown in Fig. 8 the pin I32a is caught by the surface I88a and is caused to move toward the right, thereby causing the cam I32 to rotate counterclockwise and to cause its lobe I32b to engage a pin I3Id on the dog I3I to move it toward the right thereby causing dog tooth I3Ib to be withdrawn from a tooth space I05b between teeth I05a. The point of the tooth I3Ib is retracted at least so far toward the left that it may be engaged by a beveled surface I051: of the immediately adjacent tooth I050. At that time the pin I3Id of dog I8I will ride upon the high part of the lobe I32b and will hold the dos I3I in the retracted position, so that intermittent movement of the ratchet I05 may take place when the slide 91 is moved from right toward left into the position shown. As the slide 91 approaches the position shown in Fig. 8 to complete an increment of rotation of the shaft I08, the notch surface I88b of the extension I38 will engage the pin I32a to cause the cam I32 to rotate clockwise and thereby remove the. lobe I82b from engagement with the pin I3Id so that the dog I8I may be restored to ratchet locating position. The dog I3I is restored to ratchet locating position not only by the spring actuated plunger I34, 'but also as the result of engage- Paper folding and feeding mechanism Referring to Figs. 4, 5 and 17. shaft 83 drives a crank disc I40 having a cross T-slot I which.

receivesan adjustable screw I42 having a T-head which is slidable through the slot I H and is secured in the desired position by nut I43. The screw I42 provides a pivotal connection for a connecting rod I44 pivotally attached at I45 to a cup-shaped pawl carrier I 80 the hub of which carries a press-fitted bearing I5I (Fig. 11) which is journalled. on the hub I53 of a bevel ear I52 and also upon a collar I54; pinned at I540 (Fig. 4) upon a shaft I58. Pawl carrier I I8 is threadedly engaged by screws I51 which provide pivots for three pawls I58 (Fig. 5) engageable with a ratchet I59 which is connected by pins I80 with the gear I52. Springs I8I yieldingly urge the pawls I58 against the ratchet I59. The pawls I58 may be lifted away from the ratchet I59 by lifter pins I82 carried by a lifter pin ring I88 journalled upon the hub I58 of the pawl carrier :58. A nut I threadedly engaglns the collar I54 retains the pawl lifter pin carrier I83 an the pawl carrier I in position between the nut I55 and the ratchet I59. When it is desired to retract the pawls I88 from the ratchet I58, the operator turns the ring I83 clockwise as viewed in Fig. 5, thereby causing the pins I82 to cam the pawls I58 away from the ratchet I59. 'A detent ball I84, urged by a spring I85, yieldingly retains the ring I83 either in its pawl lifting position or in its. non-pawl lifting position. When this ad justment has been made, then theshaft I58 may be turned manually by applying to its squared end I580 a suitable wrench or crank, not shown.

The shaft I58 is journalled in bearingsprovided by the brackets 88 and 89; and it is driven by the bevel gear I52 and it drives another bevel gear I90. Referring to Figs. 5, 9 and 17, the gear I52 drives a gear "I which is mounted upon and drives a shaft I12 journalled in two plates I13 and I14 which extend verticall from a subbase plate I18 resting upon the main base 80. Shaft I12 carries a forming roller I80 and a gear I8I which meshes with a gear I82 which drives a forming roller I83jkeyed to a shaft I84. As shown best in Fig. 3, shaft I84 is rotatably supported by bearing blocks I85 slidable in ways I88 which are provided by the two plates I 13 and I14. The blocks I85 are urged downwardly by spring I813 confined by plates I88 which are connected by screws I89 with the plates I13 and I14. The springs I81 yieldingly urge roller I83 toward the roller I8I in order that these rollers may grip strips of paper fed between them whereby the strips are propelled between rollers and are formed, while thus longitudinally moving into a certain shape incident to the complete formation or folding of the paper, as will be described later.

Referring to Figs. '7 and 1'1 the beveled gear I90 drives a smaller bevel gear I9I which drives a shaft I92 journalled in bearings provided by the two plates I13 and I14 and driving a forming roller I93 and a gear I94. Gear I94 drives a gear I95 which drives a forming roller I98 mounted on a shaft I91. Shaft I91 is iournalled in bearing blocks I98 guided .by ways I99 provided by the plates I 13 and I14 (see also Fig. 3). The blocks I98 are urged downwardly by springs 200 confined by plates 2" attached to'plates I13 and I14 by screws 282. The springs 208 yleldingly urge the roller I98 against the roller I93 in order to grip the paper and form it in accordance with one of the steps necessary to the formation of paper preparatory to its use as a staking member for assembly with a slotted armature core.

the machine to insert strips of folded papers in all of the slots of an armature core and also to partially break away the core insulation which envelopes the core teeth, it is necessary to discontinue the feeding of paper to the mechanism which inserts paper strips in the armature core 'slots. To accomplish this. the feeding-mecha-v nism is momentarily disabled through the use of means which elevates the rollers I 83 I98 out of contact with the paper which passes between At a certain point in the cycle or operationof tion and comprisingsedions guided by plates 2l8 and engageable with stop screws 218 carried at the ends 228 of arms 22] pivoted upon pins 228 attached respectively to plates I18 and I18. Levers 22l are each provided with a roller or other wearpiece 228 cugageable with the under side of a bearing block I88. Obviously, upward movement of slides 2| 1 will cause the levers 221 to move upwardly and thus elevate the blocks I85 and the shaft I 88 and thus lift the forming roller I88 away from the paper and the forming roller I88.

By exactly similar means and in a similar manner, the slides 2l1 operate to elevate the bearing blocks I98, the shaft I88 and the forming roller I88 away from the forming roller I88. The parts which accomplish this have been given reference numerals similar to those which effect the elevation of the roller I88 but with the aflix a.

The timing of the cams 2l5 and 2l6 with respect to other operating elements of the machine will be described fully later. For the present. it will sufllce to state that the shaft 2l2 rotates once during each cycle of'operation of the machine. Therefore once during each cycle of machine operation the cams 2|! and 218 function to lift the forming rollers I88 and I88 out of engagement with the paper so that no feeding of paper takes place, although the rollers I88 and I88 may be rotating at that time.

Referring now to Figs. to 16, inclusive, the paper P may be two ply as shown in these figures or single ply as shown in Fig. 9. The paper P is originally flat as it enters into engagement with a guide roller 238 pivotally supported by a bracket 282 attached to a cross plate 288 fixed to the side plates I18 and I18. The cross plate 288 supports a bracket 288 upon which are mounted forming plates 285 and 288 whichchange the piece of paper P from flat, as shown'in Fig. 10, to inverted 282 supported between the side plates I18 and I14. The paper then passes between the rollers I88 and I88 where it is formed into the shape shown in Fig. 15. Asthe paper passes from the plates 288 and 2 to the rollers I88 and I88, it is maintained in the condition shown in 1'18. 14

by p it between rollers 288 and 288. Roller-- 288 is pivotally supported by a bracket 288 attached to the bracket 282. Bracket 288 is prowhich a man arrives as shown inl 'ig. 1s; The

roller 288 is pivotaliy supported by the bifurcated I end of a lever 281 pivotid-at 288 upon a brachct the plates "8 and I'll." '1'! right hand end of apparatus for severing it from the supply and inserting it into. armature core slots.

, Strip severing and inserting mechanism Referring to Fig. 24, the crank 51 of shaft 82 is associated with a connecting rod comprising caps 218 and 2'" secured by screws 212 and a tumbuckie 218 connected with a pivot-block 218 journals led on a cross-pin 21! carried by a slide .1 the pedestal bracket 48. Sleeve is provided with a slot which receives a blade 218 secured to the block 218 by screws 218 and a bar 218a. Similarly, the crank 11 of shaft 12 is associated with a connecting rod comprising caps 280 and 28! fixed by screws 282 and a turnbuckle 288 connected with a pivot lock 288 journalled on cross pin 288 carried by a slide block 288 slidable in ways 281 provided by the pedestal ll. Sleeve -88 is provided with a slot for receiving a blade 288 secured to the slide 288 by screws 288 and a. bar 288a. 'lhe cranks 81 and 11 of shafts 82 and 12 are geared together so that .the blades 218 and 288 are reciprocated concurrently into and out of the slots of the armature core A adapted to be supported in the sleeve 48. The motion of blade 218 is to sever length of strip material and force it into core slots. Theiunction of blade 288 is to partly sever or break away the a slot insulation 8 which surrounds the armature core teeth, so that, the portions of insulation located adjacent the core teeth peripheries may easily be removed by contact with a rotating wire brush.

4 Pedestal I8 is provided with an opening 288 288carriedbyaplate28l. Levcr281isur8c clockwise by a spring 288' the compresion of whichiseifectedbyanadjusflngscrewlll screwthreadedlyconnectedwiththelever281andsecuredinthedesiredpos'iiionotbfa locknut282. atterthepaperhasbeenformom time 288 issupportcdbybnchets 28! for receiving a bushing or sleeve 2 attached to the pedestal 88 by screws 282. Bushing 28l guides a plunger 288 carrying a blade 288a extending through a slot in the sleeve l8. The plunger 288 is actuated toward the core by a lever 288 moimted on a shaft 288 and operated by a hand lever 288 against the action of a spring 281 which. urges the plunger 288 against the arm 288a. Blade 288 is received by a core slot the collet chuck'lll.

Block 218 slides on ways 211 provided by pedestal 88 is providedwith a side opencore tooth insulation to be partially broken away as shown in Fig. 26.

It will be observed that the strip P is severed by movement of the blade 213 in a direction radially of the slot and coincidental with the longer cross sectional dimension of the strip. In order to sever the strip P in this manner without permitting it to buckle, means have been provided for compressing the strip just above the blade 3I3. The strip is compressed against a portion of the sleeve 43 by a finger 3 provided on the end of a lever 312, pivoted at 313 on a bracket 3 having an extension 313 provided with a lug 318. Lug 3 has a recess 3" for receiving a spring 3l3 seating in a recess 3l3 provided by the lever 3i2. Lever 3i2 has a cam follower surface 323 engaged by a cam 32! carried by the slide 213. The cam 321 is shaped so that the strip P will be compressed by the finger 3 during the first portion of the downward stroke of the slide 213. Compression of the strip P takes place before it is engaged by the blade 218. By

maintaining the strip P in compressed condition, the shearing of the strip by movement of a shear blade in the direction parallel to the longer cross sectional dimension of the strip is facilitated.

Clutch and clutch control v fastened to shaft 32 by key 338 (see Fig. 22).

Spring 333 is attached at one end to the arm 334 and at the other end to a stud 333 provided by the collar 331. As shown in Fig. '18, the arm 334, when urged by the spring 333 against the step 333, so locates the pin 333 that it connects together the shaft 32 and the sleeve 333, thereby connecting the gear 31 with shaft 32. In Fig. 19 the pin 333 is shown in such position that the gear 3| and its sleeve 333 are disconnected from shaft 32. Sleeve 333 and gear 3| are retained on' the shaft 32 by a washer 32a and a nut 32b.

Pin 333 is caused to be located in this position as a result of the am 334 striking a bar 343 which is slidable in a groove 3 provided by the pedestal 43. The bar 343 terminates at its lower end at a cam follower 342 engageable with a cam 343 connected .with a sleeve 344 which terminates in a handle or knob 343 located in front of the machine (see Fig. 2). The sleeve 344 is Journalled in bearings provided by the pedestalbracket 43 and it supports a shaft 333 to which a pin 33! secures a disc 332 provided with an arcuate slot 333 and receiving a pin 334 attached to the cam 343.

equal to N (the number of core slots) plus one. I

The armature illustrated in Fig. 18 requires fourteen reciprocations of the crank shaft 32 to insort fourteen strips P in the fourteen armature slots and then one additional reciprocation is required in order that the last slot to receive a strip P will be indexed one additional increment to bring it into alignment with the blade 238 which partially breaks away the peripheral insulation of the core. Therefore, it is apparent that the shaft 333 must rotate.once while the crank shafts 32 and 12 make 15 reciprocations.

Fig. 18 shows the condition of the shaft and the disc 332 driven thereby toward the end of the cycle of operation of the machine. As the disc 332 rotates clockwise, it causes the pin 334 I and the earn 343 to rotate clockwise. It will'be .ture assembly operated upon is removed, and in- 2l3 and 213, drives a beveled gear 333 meshing I with a beveled gear 331 pinned to shaft 333. As stated before, the shaft 212 is so geared to shaft 33 that the former makes one'complete revolution for fifteen reciprocations of the crank shaft 32. It will be understood that the number of these reciprocations depends on the number of slots in the armature core. this number being seen that cam 343 is about to engage the follower 342 on the end of clutch throw-out bar 343. As the cam 343 rotates from the position shown in Fig. 18 to that shown in Fi 19, the bar 343 is lifted so that it will engage the arm 334 of clutch pin 333 as shown in Fig. 19, thereby bringing the intermediate cross hatched portion of pin 333 (see Fig. 19) in such position as to free the sleeve 333 from the shaft 32, whereupon the gear 3! may rotate while the cranks are at rest.

In order that the crank shafts 31 and 11 will be promptly brought to rest, the shaft 32 is keyed with a brake drum 333 engaged by brake shoes 33l supported on a pin 332 which is carried by bracket 362a attached adlustably to table 43 by a screw 3621) urged toward the drum 333 by a spring 363 which surrounds a bolt 334 passing through ears of the shoes and-receiving a nut 363 by whichthe tension of the spring 333 may be adjusted in order to vary the application of braking pressure to the drum 333.

At the end of a cycle of operation of the machine, the pedal I33 is depressed to release the armature shaft S from the chuck III, the armacomplete armature assembly is inserted in its place. While the new assembly is being located in the sleeve 43 by the blade the handle 236 (Fig. 2) having been turned for this purpose, the pedal 133 is released to permit the chuck. III to grip theshaft S of this new assembly. Then the machine is started again by rotating the knob 343 counterclockwise as viewed in Fig. 1. Referring to Fig. 6, it will be noted that the arcuate slot 333 in the disc 332 provides suillcient clear once for the pin 334 so that the cam 343 may be manually turned out of engagement with the cam follower 342, whereupon the bar 343 returns to the position shown in Fig. 18 by gravity and by the action of a spring 313 which surrounds a rod 3" carried by lugs 312 integral with a cover plate 313 which includes the groove in which the bar 343 is slidable. The spring 313 is confined between the upper lug 312 and a lug 343a integral with the slide 343.

While the embodiment of the present invention as herein disclosed, constitutes a preferred form, it is to be understood that other forms might be adapted, all coming within the scope of the claims which fr llow.

What is claimed is as follows:

1. Apparatus for folding coil retainer members for electrical apparatus from flat stock, compris for deforming and creasing the strip first on each side of a medial line into a single U-shape mem ber and for gripping the strip material so as to pull the strip from the supply and for feeding the strip to the remaining deforming members,

set U-shaped members of'equal length while the IQ remaining deforming member cooperates to bend the intermediate portion of the strip along the center line of said stripinto another U-shaped portion so as to set up internal stresses tending to straighten the intermediate portion; means for holding the last mentioned formation until same is inserted into a slot provided by the electrical apparatus.

2. Apparatus for folding coil retainer members for electrical apparatus from flat stock, compris- 2o ing in combination; a support for a supply of flat strip insulating material; means for bending the strip into semi-cylindrical form; a driving and a driven roller for ripping and bending the semicylindricsl form into a channel to provide sub- 5 stantial parallel arms and for advancing the strip forwardly; stationary dies for folding the arms toward each other and against the intermediate portion in a set position; and a pair of cooperating rotating members for temporarily bending said strip along a medial line to set up internal stress and causing said folded arms to engage each other to provide a pair of U-shaped portions and an inverted U shaped portion said arms of the inverted U being capable of m'ovingin opposite direction when free.

3. Apparatus for folding a retainer member from flat stock, comprising in combination; a

support for a supply of flat stock of stiff papa a series of cooperating deforming members for 40' of the central portion of the strip; and means for temporarily bending longitudinally the central portion of the stripinto a U-member so that the side edges of the strip will be adjacent each other but capable of moving in opposite directions when the free endsof the U-member come in contact 'with an element within a slot of the apparatus wherebythe element is held within the slot. 4. A machine for folding coil retainer tionpiecesforelectricalapparatus fromstiifiiatstrip-paper which comprises, in combination;

means'for longitudinally and progressively bendingthecrosssectlonalshapeotthepaperoneach sideof amediallinefromflat'to U-slmpe portions,

cooperating rollers fornrst bending and conditioning certain fibers of the so.

and1

of the normal plane of the flat strip stationary- (i188 forbendingthesaidside portions against the flat portion of the strip to provide opposed fixed U-portions, and means for bending the flat portions along the medial line into a U-shape to cause the opposed U-portlons of the-strip to be turned inwardly toward the center of the last mentioned U-portion until the side edges are adjacent each other, ami means for holding the U-members together prior to the insertion of the retainer through throat and into slots provided by the electrical apparatus said flxed U-portions spreading in opposite directions so that the yoke of the last mentioned U-portion seals the throat.

paper comprising in combination: a support for I a supply of flat strip insulating paper; stationary dies for bending progressively the flat strip into semi-cylindrical form; a driving roller and a driven roller cooperating for conditioning the fibers on a. line on each side of the normal center lineofthestripsothatthestripedgesmaybe easily bent subsequently toward the center line, said roller also gripping the strip to advance some forwardly; stationary dies for folding the strip edges along the conditioning lines so that said edges are held substantially in a fixed relation against the intermediate portion of the strip: a second driving roller and a driven roller for bending the intermediate portion of the strip along its center line to enclose the folded portions to v form the coil retainer, the bending of the intermediate Portion 11 8 such that internal are set up tending to straighten the intermediate portion after the retainer is pushed through a throat of a slot of the electrical apparatus. slid folded-in portion extending beyond the edges of the throat while the intermediate portion seals the throat, V

8. A machine for making coil retainers for electricalapparatusfromaflatstripofinsulating paper comprising in combination; a support for ampply of flat strip paper; a driving rollerand adrivenrollercooperatingtosrlppinlandcreasingthe'striptoadvance thesame forwardly; stationarydiesforfoldingthestripedgesalongthe creases of-the strip into a set position; a second driving and a driven roller cooperating for bendmg the strip-along the center line of the flat portion to form a temporary U-shsped retainer said bending setting upstressesiending to 'fll ten' said intermediate portion; means for holding the retainerinUfoI-mpiiortotheinsertionofthe retainerintotheslotsprovidedbytheele'etrical apparatus. saidintermediste portion returning,

toward byvirtue'ofits own resiliency, normal pcsitinpwhenssidholdingmeansisremoved.

homeroom. 

